852 results about "Ferric" patented technology

The invention relates to the technical field of biocatalysts, in particular to a FeCo-NC bimetallic monatomic nano-enzyme as well as a preparation method and application thereof. The preparation method of the nano enzyme comprises the following steps: preparing Co-ZIF-8 from zinc nitrate, cobalt nitrate and 2-methylimidazole; the Co-ZIF-8 and ferric chloride are used for preparing the FeCo-NC bimetallic monatomic nano-enzyme, the molar ratio of the zinc nitrate to the cobalt nitrate is (20-30): 1, and the molar ratio of the cobalt nitrate to the ferric chloride is (2-6): 1. The nano-enzyme prepared by the embodiment of the invention is of a monatomic structure, has double-enzyme activity, can simultaneously simulate catalase and NADH oxidase, and has the capability of removing active oxygen.

The invention provides a gold leaching agent for treating high-carbon gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the gold leaching agent, guanidinium thiocyanate is used as an agent main body, a hydroximic acid compound is used as a complexing synergist, and soluble inorganic salt of ferric iron is used as a competitive adsorbent. In a leaching system, guanidine thiocyanate can be decomposed to generate guanidine, sodium sulfide, sodium thiocyanate and water. Thiourea anions are converted into cyanamide under the alkaline condition, then cyanamide is slowly released and decomposed into cyanide ions, the cyanide ions are complexed with gold ions, and gold leaching is achieved. Namely, guanidinium thiocyanate has the effect of releasing the cyanide ions step by step, and slow release of the cyanide ions is realized. The gold leaching agent system does not contain cyanide (sodium cyanide, potassium cyanide and the like) and is a clean and environment-friendly agent system, and efficient leaching of gold in high-carbon gold-bearing minerals can be achieved through the synergistic effect of all functional agent components.

The invention relates to the technical field of water treatment, and discloses a modified polyaluminum chloride flocculant and a preparation method thereof.The modified polyaluminum chloride flocculant is prepared from, by weight, 50-65 parts of polyaluminum chloride, 8-12 parts of magnesium silicate, 5-8 parts of carboxymethyl chitosan, 15-25 parts of polyaluminum ferric chloride and 3-5 parts of tea polyphenol; the molar ratio of aluminum ions to iron ions in the modified polyaluminum chloride flocculant is (3-4.5): 1. According to the invention, an inorganic-organic dual-modifier synergistic effect mechanism is adopted to construct a'rigid framework-flexible network 'composite structure, and the structure can significantly improve the adsorption capacity of Pb < 2 + >. Meanwhile, the mechanical property of the flocculating agent is improved, so that the flocculating agent can be applied to a high-turbulence environment.

In one aspect, a preparation method for ferric phosphate includes the following steps: (a) feeding a ferrous sulfate solution and a phosphate solution including hydrogen peroxide simultaneously into a first reactor for mixing and reacting to obtain nucleated ferric phosphate; wherein a molar ratio of iron element to phosphorus element in the feeding process is 1:1, and a stirring speed is 500-600 r / min; (b) discharging the nucleated ferric phosphate to a second reactor for growth to obtain amorphous ferric phosphate slurry, and post-processing the amorphous ferric phosphate slurry to obtain the high tap density ferric phosphate; wherein a stirring speed is 120-150 r / min. The first reactor is a small-volume reactor, and the second reactor is a large-volume reactor.

The invention discloses a vanadium-doped modified ferric sodium pyrophosphate material based on spray drying as well as a preparation method and application of the vanadium-doped modified ferric sodium pyrophosphate material. The material has a spherical porous morphology, and the particle size is 1-10 microns; the chemical formula is Na (4-x) Fe (3-x) Vx (PO4) 2P2O7, wherein x is more than 0 and less than or equal to 0.1. The material is prepared by adopting a spray drying method, and atomic-scale mixing of vanadium and iron is ensured through a uniform and stable complexing ion solution; and the formation of porous spherical morphology is promoted through the volatilization of the acidic base solution in the rapid drying process. A spray drying method and a trace vanadium doping technology are combined, so that more active sodium sites in the ferric sodium phosphate pyrophosphate positive electrode material can be activated, the reversible de-intercalation sodium capacity can be improved, sodium ion diffusion can be promoted, the polarization voltage can be reduced, and the cycling stability of the material can be improved.

The invention relates to a preparation method and application of a mine water flocculation agent with an adsorption function. The mine water flocculation agent is prepared from the following raw materials: a mineral material, chitosan, water, silicate, acid, aluminum chloride salt, ferric chloride salt and polyacrylamide. The preparation method comprises the following steps: carrying out heat treatment on a mineral material, then adding water and chitosan, then adding silicate, reacting to generate polysilicic acid, grafting the polysilicic acid on chitosan macromolecules, then adding aluminum chloride salt and ferric chloride salt, reacting, finally adding polyacrylamide, and aging to obtain the composite material. The mine water flocculating agent provided by the invention can synchronously remove suspended matters, fluorides and COD (Chemical Oxygen Demand), and has the advantages of low dosage, short reaction time and high settling speed.

The invention provides a carbon quantum dot-ferric oxide nano composite material as well as a preparation method and application thereof. The composite material is prepared by the following steps: S1, mixing a ferrous sulfate solution with an imidazole methanol solution, and performing ultrasonic treatment to obtain a zeolite imidazate skeleton structure material containing an iron core; s2, calcining the zeolite imidazate skeleton structure material in an environment with a temperature range of 200-700 DEG C and oxygen partial pressure of 5-40% to obtain iron oxide with a complex frame structure; s3, synthesizing graphene carbon quantum dots with the size of 5-8 nm by adopting a trinitrophenol method; s4, the carbon quantum dots and ferric oxide powder are mixed and then evenly ground in a ball mill, the ball milling time is 60-240 min, the content of the added graphene carbon quantum dots is 0.5-3 wt%, and a carbon quantum dot-ferric oxide nanocomposite is obtained; according to the method, ferric oxide with a complex framework is compounded with the graphene carbon quantum dots, so that indoor VOCs can be oxidized at room temperature.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ferric pyrophosphate positive electrode material as well as a preparation method and application thereof. The invention provides a preparation method of a sodium ferric pyrophosphate positive electrode material, which comprises the following steps: (1) mixing an iron source, a sodium source, a phosphorus source and citric acid for the first time, and performing spray drying for the first time to prepare a first precursor with D50 of 10-12 [mu] m; performing secondary mixing on an iron source, a sodium source, a phosphorus source and citric acid, and performing secondary spray drying to prepare a second precursor with D50 of 3-5 microns; the iron source comprises a first iron source with D50 of 1.1-1.8 [mu] m and a second iron source with D50 of 0.3-0.8 [mu] m; the mass ratio of the first iron source to the second iron source is (0.3-0.5): (0.5-0.7); and (2) mixing the first precursor, the second precursor and sodium metaborate, and sintering to obtain the sodium ferric pyrophosphate positive electrode material. After the prepared pyrophosphate ferric phosphate sodium positive electrode material is prepared into a pole piece, the compaction density is proper, and the prepared battery is high in specific capacity and cycle performance.

The invention discloses a magnetic biochar-based saline-alkali soil conditioner as well as a preparation method and application thereof, after a biochar material is loaded on ferrous iron, the biochar material is subjected to alkaline oxidation to obtain ferroferric oxide and a porous biochar material in a stable state, and finally activated humic acid, betaine, trehalose and melatonin are combined with magnetic biochar. The magnetic charcoal-based saline-alkali soil conditioner is low in price and easy to obtain and has a good improvement effect on physicochemical properties of saline-alkali soil and promotion of rice growth, and the preparation process is simple and easy to operate.

The invention discloses a composite water purifying agent based on polyaluminum ferric sulfate. The preparation process comprises the following steps: 1, reacting ferrous sulfate heptahydrate, aluminum sulfate, sodium chlorate, phosphoric acid and the like to prepare a polyaluminum ferric sulfate solution; 2, mixing the modified polyacrylamide solution with the polyaluminum ferric sulfate solution for reaction to obtain a composite system; and step 3, adding acidic ochre soil into the composite system to obtain the composite water purifying agent. The preparation method has the beneficial effects that a modified monomer is prepared through organic synthesis, and the modified monomer is copolymerized with monomers such as acrylamide to prepare modified polyacrylamide; then, the organic polymer is compounded with a polyaluminum ferric sulfate solution and acidic ochre soil, and an inorganic-organic-mineral ternary water purification system is constructed; the composite water purifying agent has the high-efficiency electricity neutralization capability of an inorganic flocculating agent, the bridging flocculation effect of organic macromolecules and the adsorption performance of minerals, and shows excellent flocculation and sedimentation effects and pollutant removal capability.

The invention provides a purification and impurity removal method of a crude nickel-cobalt-manganese sulfate solution. The purification and impurity removal method comprises the following steps: (1) adding sodium thiosulfate into the crude nickel-cobalt-manganese sulfate solution to remove copper; (2) phosphate is adopted, the pH value is regulated, and titanium, iron, aluminum and the like are removed; (3) ferric sulfate is added, the pH value is regulated, and phosphorus and silicon are removed; (4) adding a bismuth agent and regulating the pH value to remove chlorine; (5) adding a fluorine agent to remove calcium and magnesium; and (6) adding a tillite mineral adsorbent to remove fluorine. According to the method, iron, aluminum, copper, fluorine, phosphorus, titanium, calcium, magnesium, chlorine, silicon and other elements can be efficiently removed from the rough nickel-cobalt-manganese sulfate solution, the loss of main metal is low, the prepared high-purity nickel-cobalt-manganese sulfate solution can directly meet the requirement of a precursor solution of a battery preparation level, the process is simple, the operation difficulty is low, industrial large-scale production is easy to achieve, and the method is suitable for industrial production. And the defects of the current preparation method of the high-purity nickel-cobalt-manganese sulfate solution are overcome.

The invention discloses ferric sodium pyrophosphate, a preparation method, a positive pole piece and a sodium ion battery, and belongs to the technical field of secondary batteries. The preparation method comprises the following steps: S1, mixing a phosphorus element, an iron element, a sodium element and a carbon element in a phosphorus source, an iron source, a sodium source and a carbon source according to a molar ratio of (1-5): (1-3): (1-5): (0.1-0.5); adding a dispersing agent and an organic solvent; s2, carrying out ball milling on the mixture obtained in the step S1; s3, carrying out vacuum drying on the mixture subjected to ball milling; and S4, sintering the material treated in the step S3 to obtain the ferric sodium pyrophosphate. The preparation method of the ferric sodium pyrophosphate comprises the following steps: uniformly mixing a phosphorus source, an iron source, a sodium source and a carbon source through ball milling, and sintering to obtain the ferric sodium pyrophosphate. The ferric sodium pyrophosphate is prepared by adopting a solid phase method, the preparation steps are simple, and large-scale production is easier.

The invention discloses a preparation method and sodium storage application of a sodium-enriched sodium ferric sulfate composite material. The preparation method comprises the following steps: carrying out low-speed ball milling on iron-based sulfate and dispersed CNTs (Carbon Nanotubes), carrying out vacuum drying, carrying out heat treatment, and naturally cooling to room temperature to obtain FeSO4 / CNTs; the preparation method comprises the following steps: mixing FeSO4 / CNTs and anhydrous Na2SO4 according to a molar ratio of Na to Fe of 7: 5.5, carrying out low-speed wet ball milling, carrying out vacuum drying, and grinding to obtain Na2SO4 / FeSO4 / CNTs; and compacting Na2SO4 / FeSO4 / CNTs, placing the Na2SO4 / FeSO4 / CNTs in a tubular furnace, preserving heat at 350-400 DEG C for 10-24 hours, cooling to room temperature, and grinding to obtain the Na7Fe5.5 (SO4) 9 / CNTs composite material. The Na7Fe5.5 (SO4) 9 positive electrode material disclosed by the invention has good sodium storage specific capacity, excellent rate capability and stable long cycle life.

According to the method, phosphomolybdic acid, copper chloride and ferric chloride serve as precursors, copper and iron-containing phosphomolybdic acid nano-enzyme (Cu, Fe-PMs) with peroxidase-like activity is synthesized through a microwave method, under the acidic condition, on one hand, the surface of Cu and Fe-PMs carries negative charges, high affinity is generated between Cu and Fe-PMs and a substrate TMB with positive charges, and on the other hand, the surface of Cu and Fe-PMs has negative charges; on the other hand, Cu / Fe / Mo three-metal redox couple accelerates the regeneration of Fe < 2 + > and plays an important role in the activity of peroxidase, and meanwhile, due to the introduction of sodium dehydroacetate, Cu and Fe in Cu and Fe-PMs and pyranoid ring and keto O in sodium dehydroacetate interact through coordinate bonds to cause electron interaction, so that the peroxidase-like activity of Cu and Fe-PMs is enhanced, and the peroxidase-like activity of Cu and Fe-PMs is improved. And the Fenton reaction is enhanced through transfer of electrons among the sodium dehydroacetate, the Cu and the Fe-PMs. When Cu and Fe-PMs oxidize TMB and H2O2, sodium dehydroacetate enhances the absorbance of the system, and on the basis, a novel colorimetric rapid detection method of sodium dehydroacetate is established.

The invention provides sodium vanadium ferric phosphate pyrophosphate as well as a preparation method and application thereof. The sodium vanadium ferric phosphate pyrophosphate comprises an inner core and a coating layer coating at least part of the surface of the inner core; the molecular formula of the inner core is as shown in formula 1; na (10 + 6x) / 3 Fe (7-3x) / 3 V2x (PO4) (6x + 4) / 3 (P2O7) Formula 1; wherein x is greater than or equal to 0.25; the coating layer comprises a carbon element, a boron element and a nitrogen element. The sodium ferric vanadium phosphate pyrophosphate has excellent reversible capacity and conductivity.

The invention relates to a special fertilizer suitable for saline-alkali soil and a preparation method thereof. The fertilizer is granular and has a multi-layer structure which is sequentially arranged from inside to outside: a nutrition core layer, a controlled release film layer, a soil improvement fast exchange layer and a microorganism attaching layer. The nutrition core layer contains nitrogen, phosphorus, potassium and medium trace elements, and meets the basic nutrient requirements of crops; the controlled release film layer is self-assembled layer by layer by adopting alginate / chitosan, a humic acid-ferrous complex and a breakable cross-linking point are inserted into the film, and starch is sprayed on the outer layer, so that an ionic strength / alkalinity dual-response controlled release system is formed; the soil improvement quick exchange layer contains microcrystalline gypsum and ferrous sulfate; the microbial epiphytic layer fixes salt-tolerant phosphate solubilizing bacteria, potassium bacteria and exopolysaccharide-producing bacillus by using a charcoal-zeolite carrier, and the bacteria are distributed on the surfaces of the particles in a dotted manner. The fertilizer realizes organic combination of soil improvement, fertilizer supply and microbial regulation and control, can significantly reduce the soil salinity and alkalinity in a saline-alkali soil environment, and improves the fertilizer utilization rate and the crop growth performance.

The invention relates to the technical field of positive electrode materials, and discloses a preparation method of a carbon-coated fluorine-doped sodium ferric sulfate positive electrode material, which comprises the following steps: step 1, adding an iron source, a sodium source, a sulfur source, a carbon source and a fluorine source into deionized water, and heating and stirring to completely dissolve the raw materials to obtain a solution A; 2, converting the solution A into precursor powder B by using a spray drying method; and 3, calcining the precursor powder B in an inert atmosphere, and crushing and grinding the obtained product to obtain the carbon-coated fluorine-doped Na2Fe2 (SO4) 3 positive electrode material. The F element with higher electronegativity than the S element is introduced, so that the overall electron distribution of the material is changed, the structural stability is improved, and the high-conductivity carbon protection layer is coated on the surface of the active material to form a conductive network, so that the resistance is reduced, the volume expansion is relieved, and the battery capacity and the cycling stability can be obviously improved.

The invention discloses a preparation method and application of a composite catalyst for preparing aromatic hydrocarbon through hydrogenation of carbon dioxide, the composite catalyst is formed by compounding an iron-based catalyst and an HZSM-5 molecular sieve, the main active components of the iron-based catalyst are Fe3O4 and iron carbide, the preparation method comprises the steps of preparation of modified ferric oxide, preparation of modified ferroferric oxide, preparation of the iron-based catalyst and the like. The preparation method provided by the invention improves the adsorption activation capability of carbon dioxide on the composite catalyst and the anti-poisoning stability of the composite catalyst, and also improves the aromatic hydrocarbon selectivity of the product.

The invention discloses a coagulant material, a preparation method and application, and the method comprises the following steps: adding a silane coupling agent into water for pre-hydrolysis to obtain a pre-hydrolysis solution; secondly, a mixed solution of aluminum chloride and ferric chloride is prepared and stirred to be completely dissolved and evenly mixed, and the mass ratio of aluminum chloride to ferric chloride is 9: 1-5: 5; the pre-hydrolysis solution and a mixed solution of aluminum chloride and ferric chloride are mixed and stirred evenly, and the ratio of the total substance mass of silicon to ferro-aluminum in the silane coupling agent is 0.1-0.5; dropwise adding a sodium hydroxide solution into the mixed solution, and adjusting the alkalization degree until the mass ratio of [OH] to [Al + Fe] is 1-2; and standing and curing the solution of which the alkalization degree is adjusted to obtain the aluminum-iron covalent composite coagulant. The coagulant has the advantages of efficient fluorine removal capability, rapid floc growth, good settling performance, low aluminum residue and the like, and is suitable for wide pH range and water quality conditions.

The invention belongs to the technical field of synthetic purifying agents, and discloses a multipurpose synthetic purifying agent and a use method thereof, and the purifying agent comprises the following components in percentage by weight: 18-50% of ferric trichloride; 2-37% of polyaluminum ferric chloride; 10 to 60 percent of calcium chloride dihydrate; 22 to 52 percent of ferrous sulfate; 5-45% of polyaluminum chloride; 10-30% of basic aluminum chloride; according to the invention, COD in wastewater can be rapidly removed, the pH value is neutralized, the hydrophilicity is changed, a diffusion layer is compressed, the counter-ion effect is increased, and the purpose of oxidation reduction is finally achieved; in the hydrolysis process, a surfactant and various pollution factors in wastewater can be effectively adsorbed and polymerized into jelly, and the jelly is rapidly precipitated and separated in a short time, so that the wastewater is purified.

The invention discloses a preparation method of a porous carbon material, which comprises the following steps: mixing indigo blue and ferric chloride, and pyrolyzing in a protective atmosphere to obtain the porous carbon material. The porous carbon material is prepared by taking indigo blue as a precursor and ferric chloride as an activating agent, the preparation method of the porous carbon material has the advantages of atom economy, simplicity in operation and low cost, the ultrahigh yield of the porous carbon material can be obtained, and the preparation method is suitable for large-scale industrial popularization and application.

The present application discloses a method for preparing ferric phosphate, including the following steps: mixing a surfactant with a first metal liquid containing iron and phosphorus elements, adding with adding seed crystal, aging under heating and stirring, filtering the aged solution to obtain a filter residue, and drying and sintering the filter residue, thereby obtaining the ferric phosphate; the seed crystal is ferric phosphate dihydrate or basic ammonium ferric phosphate. In the present application, the surfactant is used for modification of the seed crystal, secondary crystal nucleus is generated, which induces the formation of the basic framework of the product particles. Through the aging process, the deposition of the crystal nucleus on the surface of the seed crystal makes the framework of the crystal grain more complete, so that the primary particles are arranged more densely and orderly and tend to constitute spherical secondary particles.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a modified sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The chemical structural formula of the modified sodium ferric sulfate positive electrode material is Na < 2 + 2x > (Fe < 1-a-b > MaMb < 2-x > (SO4) z (PO4) < 3-z, a is more than 0 and less than 1, b is more than 0 and less than 3, z is more than 0 and less than 3, Ma and Mb are transition metal elements, and Ma is Ni; and Mb is Zn. The transition metal element is introduced and the doping proportion is controlled, so that fine regulation and control on the material performance can be realized, the conductivity and the ion diffusion rate of the positive electrode material are improved, and the structural stability and the air stability of the material are enhanced; the problems of slow Na < + > diffusion kinetics, poor crystallinity and poor material air stability of the sodium ferric sulfate positive electrode material are solved, and a new possibility is provided for the development of a sodium ion battery technology.

The invention discloses a method for separating impurity arsenic in the process of treating high-arsenic indium-containing zinc oxide smoke dust by a wet process, which comprises the following steps: when pyrogenic smelting and fuming volatilization treatment are carried out on jarosite slag and high-acid leaching slag produced by zinc hydrometallurgy, controlling the air leakage of a waste heat boiler to oxidize arsenic in the smoke dust into pentavalent arsenic; high-arsenic indium-containing zinc oxide smoke dust obtained through dust collection is treated in a two-stage leaching mode; the arsenic content of the first-stage leaching solution is controlled to be 0.5-1.0 g / L, the pH value of the second-stage leaching solution is controlled to be 1.6-1.8, the indium content in the first-stage leaching solution and the indium content in the second-stage leaching solution are both smaller than 5 mg / L, indium loss is effectively prevented, and second-stage leaching residues serve as lead and indium enrichment to subsequently recover valuable components lead and indium; adding a ferric sulfate solution into the second-section leachate to quickly generate ferric arsenate precipitate, combining the filtered filtrate with the first-section leachate, further deeply purifying to remove arsenic until the arsenic content is less than 1.0 mg / L, subsequently purifying to remove fluorine and chlorine, and electrolyzing to produce metal zinc.

The invention relates to the technical field of electro-catalysis, in particular to a modified iron monatomic catalyst based on biomass carbon as well as a preparation method and application of the modified iron monatomic catalyst. The preparation method comprises the following steps: mixing and stirring chitosan, an acetic acid solution, thiourea and ferric chloride, adjusting the pH value to 7.5-8.5, and freeze-drying to obtain an aerogel precursor; pre-carbonizing the aerogel precursor to obtain a pre-carbonized product; mixing the pre-carbonized product with an alkali reagent, and calcining to obtain a metal nanoparticle doped monatomic catalyst; and carrying out ultrasonic treatment on the metal nanoparticle doped monatomic catalyst by using a mixed acid solution, washing to be neutral, and drying to obtain the modified iron monatomic catalyst. By adopting the modified iron monatomic catalyst provided by the invention, non-polar CO2 molecules and NO3 <-> are efficiently converted into urea under mild conditions, the yield of the urea is up to 2978.6 mu g h <-1 > mgcat <-1 >, and the maximum Faraday efficiency is up to 30.4%.

The preparation method comprises the following steps: (1) weighing a sodium source, an iron source, a phosphorus source and a carbon source, quickly and uniformly mixing, and then pre-sintering at low temperature to obtain a precursor; wherein the low-temperature presintering comprises two stages, in the first stage, the temperature is increased to 60-150 DEG C and kept for 1-3 h, and in the second stage, the temperature is increased to 200-350 DEG C and kept for 1-8 h; and (2) adding a carbon source into the precursor to prepare slurry, sanding the slurry, carrying out centrifugal spray drying, and carrying out high-temperature sintering to obtain the ferric sodium pyrophosphate positive electrode material. The precursor of the high-solid-content slurry can be prepared, the problem that the solid content of the slurry is low in the grinding stage of the sodium ferric pyrophosphate positive electrode material prepared by a solid-phase method is effectively solved, the solid content of the slurry is increased, the yield of the precursor is increased, the production cost is reduced, and meanwhile, the product quality is improved. The prepared ferric sodium pyrophosphate positive electrode material has relatively high compaction density, capacity and other performances, and the performance of the product is improved.

The invention provides a method for producing carboxyl magnetic beads based on industrial solid waste, and relates to the technical field of carboxyl magnetic bead preparation, and the method comprises the following steps: preparing a saturated solution from ferrous sulfate solid waste; removing heavy metal impurities in the saturated solution by using a mixed extraction agent through an extraction method to obtain a ferrous ion crude product; synthesizing the ferrous ion crude product through a hydrothermal method to obtain ferroferric oxide particles; carrying out hydroxyl coating treatment on the ferroferric oxide particles to obtain hydroxyl coated particles; and carrying out carboxyl coating treatment on the hydroxyl coated particles to obtain the carboxyl magnetic bead material. Ferroferric oxide is produced by taking ferrous sulfate solid waste as a raw material through a hydrothermal method, then separation is carried out through a magnetic field, the separated ferroferric oxide is modified with a silicon hydroxyl coupling agent, the required iron oxyhydroxide magnetic beads are directly obtained, waste resources are utilized in an environment-friendly mode, the production cost is reduced, and the method is suitable for industrial production. And the great potential of improving the product quality and functionality is achieved.

The invention discloses a co-processing and comprehensive utilization method for solid hazardous waste in the aluminum industry, and belongs to the technical field of industrial solid waste utilization, the method comprises the following steps: S1, roasting reduction process: uniformly mixing high-iron red mud, aluminum ash, cathode carbon blocks and an active additive, carrying out first-stage dry ball milling, and feeding a ball milling material into reduction roasting equipment for roasting; s2, an iron removal process is conducted, specifically, a reduction roasting product is subjected to second-stage wet ball milling again, slurry obtained after ball milling is subjected to wet reselection desliming, and iron ore concentrate, dehydration liquid and aluminum-silicon slag are obtained through magnetic separation; and S3, a poly-aluminum preparation process: mixing and reacting the silicon-aluminum slag, the aluminum-containing filtrate and hydrochloric acid to further prepare poly-aluminum ferric chloride, and recycling the poly-aluminum slag and the desliming slag to be used in the industries of brick making, cement building materials and the like. Meanwhile, high-added-value products such as iron ore concentrate and polyaluminum ferric chloride are produced as byproducts.

The invention provides a sodium vanadium fluorophosphate in-situ coated sodium ferric sulfate / carbon composite material and a preparation method thereof.The preparation method comprises the steps that raw materials including a reducing agent, an iron source, a sodium source and a carbon source are added into absolute ethyl alcohol to be stirred, sanded and mixed, and after obtained slurry is subjected to spray drying, the slurry is sintered and cooled in the argon atmosphere to obtain the sodium ferric sulfate / carbon composite material; mixing the sodium ferric sulfate / carbon composite material dispersion liquid with the sodium vanadium fluorophosphate precursor solution, performing hydrothermal reaction, centrifuging, washing and drying to obtain the sodium vanadium fluorophosphate in-situ coated sodium ferric sulfate / carbon composite material. According to the preparation method, a sodium vanadium fluorophosphate coating layer is generated on the surface of sodium ferric sulfate in situ by combining a low-temperature solid-phase method with a hydrothermal method, so that the sodium vanadium fluorophosphate in-situ coated sodium ferric sulfate / carbon composite material is obtained, the electronic conductivity of the composite material is greatly improved, and the sodium ion diffusion rate is promoted by coating of sodium vanadium fluorophosphate; fe2 + is prevented from being oxidized into Fe3 + due to direct contact between the sodium ferric sulfate and air, so that the air stability of the sodium ferric sulfate is improved.

The invention provides a resource utilization method of iron-aluminum-chromium waste acid, and belongs to the field of waste acid resource treatment. According to the hydrochloric acid type iron-aluminum-chromium waste acid, firstly, high-valence metal in the waste acid is reduced through iron powder, the acidity of a system is reduced, and the iron content is increased; secondly, high-efficiency separation of iron, aluminum and chromium is realized by accurately controlling the sodium phosphate amount, the pH value, the reaction temperature and the stirring rotating speed; and then, oxidizing an iron solution obtained by solid-liquid separation to prepare ferric chloride, and carrying out hydrothermal crystallization on aluminum phosphate and chromium phosphate precipitates to prepare chromium-containing aluminum phosphate which can be used as a catalyst. The method realizes thorough step-by-step separation of metals in the iron-chromium-aluminum hydrochloric acid type waste acid, realizes resource utilization, is free of waste gas and waste residues in the process, meets the green and environment-friendly requirements, and has remarkable environmental and social benefits.